Concrete-column mold



c. L. MEYER AND R. 0. MQcMONAGLE. CONCRETE COLUMN MOLD. APPLlCATlON FILED AUG-411919- 1,364,946, Patented Jan. 11,1921.

I 177%? Z5715: 02a riaslowb Mayor dame-55..-

UNITED STATES PATENT.OFFICE CHARLES L. MEYER AND ROY O. MAOMQNAGLE, OF OMAHA, NEBRASKA.

CONCRETE-COLUMN Mom).

Application filed August 4, 1919.

1 0 aZZ whom it may concern:

Be it known that we, CHARLES L. MEYER and ROY O. MAOMONAGLE, both citizens of the United States, residing at Omaha, in the county of Douglas and State of-Nebraska, have invented certain new and useful Tmprovements in C'oncrete'Column Molds, of which the following is a specification.

This invention relates to metal molds for the erection of concrete columns, and the principal object of the invention is to provide a simple and efficient column mold structure inexpensive to manufacture, easy to assemble, and characterized by ahigh degree of strength. More specific objects of the invention are, first, to provide a sheet metal sectional mold of such a structure as to leave minimum mold marks in the surface of the concrete at the vertical joints of the mold, and, second, to provide an improved system of bands or hoops for supporting the cylindrical sections of the mold or'form against radially bursting strains caused by the wet concrete before the latter is set or hardened.

In the accompanying drawings, we have illustrated a practical embodiment of the invention which in practice has been found to satisfactorily fulfil'the stated objects of the invention, and referring thereto- Figure 1 is a vertical elevation of anas: sembled column mold;

Fig. 2 is an enlarged cross-section on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary elevation in the region of one of the main hoops or rings Fig. 4 is an enlarged cross-section through one of the vertical lap-joints of the cylindrical form just above one of the mainhoops or rings, illustrating the form of the joint and the notching of the hoop or ring to straddle the joint; f

Figs. 5 and 6 are side and edge elevations of one of the intermediateauxiliaryhoops or bands, illustrating the longitudinal adjustability thereof; and j Fig. 7 is a fragmentary cross-section just above one of the auxiliary hoops or bands showing the latter applied to the mold cylinder.

Referring to the drawings, 5, 6 and 7 designate as entire-ties a plurality of cylindrical sections superposed on each other in telescoped relation and together forming the body portion-of the -rnold,a nd 8 designates as an entirety a flared or tapered form mountother section.

Specification of Letters Patent. Patented J an. 11, 1921,

Serial No. 315,094.

ed on the upper body section 7 and constituting the head or cap portion ofthe mold.

Each of the body sections 5, 6 and 7 is made up of a plurality of transversely curved sheet metal sections 9, with their vertical edges in overlapped relation. These sheet metal sections 9 are of varying widths, and all of the sections except the narrowest are made in widths which are even multiples from center tocenter of the joints ofthe width of thenarrowest section. By means of thi's'scheme which, however, is not broadly new with us, it is possible to erect the severalbody sections 5, 6 and 7 of the column form by a proper selection of the sheet metal sections 9 so as to secure the particular diameter of any cylindrical section required.

Fig. 4 illustrates our improved form of lap-joint, from which it will be seen that the metal at one vertical edge of the section is folded outwardly twice on itself, the inner fold 10 lying substantially in contact with the wall 9 and the outer reversely bent fold ll being spaced from the inner fold 10 by the thickness of the metal, thereby forming a pocket 12 which receives the outwardly offset margin 13 of, the opposite vertical edge of another section. set to the extent of twice the thickness of the metal, which leaves the inner surfaces of the two sections 9 flush with each other. By reason of this construction of joint, no moldmark is left on the surface of the column beyond a slight fin caused by the small groove 1% in the mold betweenthe folded margin of one section and the offset of the Regardless of the "number of sheet metal sections 9 in any cylindrical section such as 5,. 6, or ,7, the lap-joints are always spaced from center to centera fixed minimum distance or an even multiple of such minimum distance and this fact is utilized to advantage in the construction ofthe main bonding rings or hoops next to be described. I

Referring, to Figs. 2 and 3, 15 designates each of a'pair of semi-circular flat ring sec tions that are pivotally united at one end by a pivot pin 16. These ring sections surround the cylindrical mold sections with their'inner edges in contact with the latter,

as shown in Fig. 2, and their free ends are In the inner edge of each ring are cut out notches 20, each of these notches being of a width sufficient to straddle a lap-joint of the cylinder; and these notches 20 are spaced apart from center to center a distance just equal to the width of the narrowest sheet metal section 9 measured from center to center of the lap-joints between which said narrowest section lies. It follows from this construction that, regardless of the number of lap-joints in any cylinder section and regardless of their spacing, the rings can always be applied with certain notches 20 thereof straddling the lap-joints, as shown in Fig. 2; thereby making it unnecessary to provide specially notched rings for any given cylinder section.

These relatively heavy rings or hoops 15 are spaced at distances varying from three to six feet apart in the column form, and hold the latter to a true circle; and at intervals between these main clamps we employ one or more relatively light band clamps 21, shown in detail in Figs. 5 and 6. Each of these is simply a light flexible steel band approximately one and one-half inches wide, and in order to make a fixed length of band serve for the different diameter column. sections. each band is provided with an outwardly turned end lug 22 at one end apertured for the passage of a stove-bolt 23 (Fig. 7), and a series of spaced holes 2 L are formed therein for some distance inwardly of the other end of the band, the holes 2 serving for the attachment of an angular fastening lug 25 as by means of small stove-bolts 536, the radially projecting member of the lug 25 being apertured to receive the bolt 23, as shown in Fig. 7. By reason of this construction, if the band is longer than is required for one of the smaller diameter cylinder sections, the lug 25 is attached thereto a proper distance inwardly from the end ofthe band, and in applying the latter the projecting portion of the band beyond the lug 25 is simply lapped beneath the mold-clamping portion of the band in the manner clearly shown in Fig. 7. r

Any desired number of these light auxiliary clamping bands may, of course be employed, or'they may be omitted altogether, so far as the other novel structural features herein above described are concerned; but the use of one or more of these light auxiliary bands in association with the main hoops or bands 15 is preferred.

l/Ve claim 1. A cylindrical mold for a concrete column, comprising a plurality of transversely curved sheet metal sections lap-jointed at their proximate vertical margins, each section having the metal on one vertical edge thereof folded backwardly on its outer side substantially in contact with the body of the section and then reversely folded over the backward fold and spaced from the latter by substantially the thickness of the metal thereby forming a narrow pocket, and having the marginal portion of the metal on its other vertical edge laterally offset on its outer side to the extent of twice the thickness of the metal and disposed in a plane parallel with the plane of the section for engagement with the pocket of an adjacent section, whereby the body portions of adjacent sections'liein the same curved plane.

2. A cylindrical mold for a concrete column, comprising a plurality of transversely curved sheet-metal sections having external lap joints at their proximate vertical margins, said sections being of varying widths that are integers or even multiples of the narrowest section, and a clamping ring or hoop surrounding said mold and formed on its inner edge with notches straddling said lap joints.

A cylindrical mold for a concrete column, comprising a plurality of transversely curved sheet metal sections having external lap joints at their proximate vertical margins, said sections being of varying widths that are integers or even multiples of the narrowest section, clamping rings or hoops surroundingsaid mold and each formed on its inner edge with notches straddling said lap joints, and one or more light clamping bands encircling said mold between said clamping rings or hoops.

4. A cylindrical mold for a concrete column, comprising a plurality of transversely curved sheet metal sections of varying widths having external lap-joints at their proximate vertical margins, said sections being of widths from center to center of said lap-joints that are integers or even multiples of the width of the narrowest section, and a clamping ring or hoop surrounding said mold and formed on its inner edge with notches that are spaced from center to center a distance'equal to the width of said narrowest section, said notches straddling said lap-joints.

5. An auxiliary clamping band for a cylindrical concrete column mold, comprising a flexible metal. band having at one end an integral bent and apertured lug and formed with a series of holes spaced at intervals from its opposite end, a detachable .apertured lug, means coiiperating with said holes for securing said detachable lug to said band opposite any of'said holes, and a clamping bolt passed through the apertures of said lugs; the portion of said band projecting beyond said detachable lug being adapted to underlie the mold-clamping portion of the band.

CHARLES LOUIS MEYER. R. O. MA MONAGLE. 

